GEODÆSlA Improved.

191

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CHAP.

Shewing how to plan (Dimensions taken by the Chainonly) all Manner of regular and irregular Inch -fures , whether bounded by curved or circularHedges , &c. and aljo to map the same if required.

Y O U must take up your Dimensions, as hath been alreadytaught in the foregoing Chapters; cast up the Content, asbefore directed, by the Pen; and though you have your Dimen-sions planned, you must not, fas Thousands have done hereto-fore) cast up from the Plan, it being impossible to tell the Linksunder ten, upon any Scale exactly; and of Consequence yourWork would be subject to Error, which your Pen is no Waysliable to when your Dimensions are accurately taken, and theProductions of your Pen in working the fame pioved as you pro-ceed ; you then may, with the greatest Certainty, rely on yourReturn of the fame.

Now, when your Dimensions ate taken and cast up, the nextThing to be done is to lay down the fame upon Paper, for whichPurpose the Scale is very necessary. There are several differentSorts of Scales (with regard to Size,) viz. Scales of equal Parts,containing I, 2, 3, 4; or 10, 20, 30, and 40 Chains to anInch; and these are decimally reduced to any other Size, ac-cording as the Measurer hath Occasion to use them.

Of Scales, and Lines thereon.

There are many Lines upon a Scale besides the Line of equalParts, namely, Lines of Proportion ; as the Line of Number, Line

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